Light adaptation and temperature effects in rat PIII retinal response: analysis with a two-state model.

Gale, John G.; Williams, Theodore P.

doi:10.1073/pnas.77.7.4021

Cited by 3 publications

(1 citation statement)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of this study lead directly to consideration of a general question that has received much attention in previous discussions of the "equivalent background" principle: does the resemblance in the adapting effects of bleaches and backgrounds derive from the expression, under these two conditions, of similar physiological activities of the visual pigment molecule? In this section, we discuss a notion, considered in somewhat different contexts by previous investigators (Donner and Reuter, 1968;Rushton and Powell, 1972;Brin and Ripps, 1977;Donner and Hemil~, 1979;Gale and Williams, 1980;Lamb, 1981), that suggests a parallel basis for desensitizations induced by sustained background light and by prior bleaching. The discussion below concerns only the description of "stabilized" states of reduced sensitivity exhibited by photoreceptors in the isolated retina.…”

Section: Implications For Photochemical Processesmentioning

confidence: 96%

Desensitization of skate photoreceptors by bleaching and background light.

Clack¹,

Pepperberg²

1982

The Journal of General Physiology

View full text Add to dashboard Cite

Through extracellular measurements of photoreceptor responses to flashed stimuli, we examined how the bleaching of rhodopsin affects increment receptor threshold in the isolated retina of the skate (Raja osceUata and R. erinacea). Both initially unbleached and previously bleached photoreeeptors, when exposed to full-field luminous backgrounds of fixed intensity, attain approximately stable levels of increment threshold that vary with the intensity of the background light. Values of stabilized increment thresholds measured after various extents of bleaching (less than -50%), when plotted against background intensity in log-log coordinates, tend to converge with increasing intensity of the background; this relationship of the increment threshold functions resembles that which Blakemore and Rushton (1965b) found to describe the transient effect of bleaching on psychophysical increment threshold for the human rod mechanism. Our data are consistent with the possibility that related photochemical processes govern the stabilized levels of receptor sensitivity exhibited by the isolated retina (a) during steady illumination and (b) long after substantial bleaching.

show abstract

Section: Implications For Photochemical Processesmentioning

confidence: 96%

Desensitization of skate photoreceptors by bleaching and background light.

Clack¹,

Pepperberg²

1982

The Journal of General Physiology

View full text Add to dashboard Cite

show abstract

The effects of temperature and light on particles associated with crayfish visual membrane: a freeze-fracture analysis and electrophysiological study

Meyer-Rochow

Eguchi

1984

J Neurocytol

View full text Add to dashboard Cite

Depending on the pre-experimental treatment, densities as well as sizes of particles associated with the visual membranes in the eyes of Procambarus clarkii varied. The highest mean particle density (5268 +/- 969 microns -2) and the smallest mean particle diameter (5.57 +/- 1.35 nm) were found in crayfish which had been kept in the dark for 10 weeks in aerated fresh water of 10 degrees C. Crayfish kept under a 12 h dark/light regime in water of 10 degrees C or 30 degrees C for three weeks displayed particle densities of 1076 +/- 180 and 2899 +/- 249 microns -2, respectively; particle diameters were of the order of 8 nm. Temperature did not alter the shape or the slope of the V/log I curves, but ERG recordings show that maximum spectral sensitivity was shifted from lambda max = 560 nm in cold water crayfish (10 degrees C) to lambda max = 580 nm in crayfish from the 30 degrees C tank, and that the 10 degrees C curve was somewhat narrower than the 30 degrees C curve. It is suggested that the observed shift was caused by a combination of factors, of which the following may have played key roles: (1) The filter effect of screening pigment granules and other intracellular components such as vesicles, vacuoles, endoplasmic reticulum, and mitochondria, some of which were developed to a considerably greater extent in 30 degrees C material; (2) increased membrane fluidity due to higher temperature as well as the presence of photoproducts in the light, and the 'countermeasures' taken by the visual pigment molecules to stabilize the lipid bilayer, e.g. higher density, possible 12-s-cis linkages etc.; and (3) increased regeneration or synthesis of rhodopsin due to higher metabolic activity of retinula cells at higher temperatures. Temperature-induced changes of visual pigments in a variety of organisms are discussed and evidence for the rhodopsin-aggregate model of crayfish visual pigment is presented. It is concluded that the retinula cytoplasm is involved in restoring depleted stocks of photopigment, and that the biological sense of possessing an increase in red sensitivity during the warm summer months lies in the correlation of light penetration in the natural habitat of P. clarkii and optimal exploitation of the habitat.

show abstract

A Statistical Framework for Generalized Linear Image Processing Systems

Deng

2016

J Math Imaging Vis

View full text Add to dashboard Cite

Light adaptation and temperature effects in rat PIII retinal response: analysis with a two-state model.

Abstract: Aspartate-isolated PIMl responses from excised perfused retinas of albino rats were studied, with emphasis on background adaptation and temn rature effects. When re-

Cited by 3 publications

References 17 publications

Desensitization of skate photoreceptors by bleaching and background light.

Desensitization of skate photoreceptors by bleaching and background light.

The effects of temperature and light on particles associated with crayfish visual membrane: a freeze-fracture analysis and electrophysiological study

A Statistical Framework for Generalized Linear Image Processing Systems

Contact Info

Product

Resources

About